Texas Instruments TPS54561QDPRTQ1

Overview

TPS54561QDPRTQ1 from Texas Instruments is an automotive-grade 4.5-V to 60-V input, 5-A synchronous step-down DC-DC converter with integrated 87-mΩ high-side MOSFET, Eco-mode™ pulse-skipping control for light-load efficiency, and 152-µA operating quiescent current. It delivers regulated 0.8-V to 58.8-V output in vehicle accessories, USB charging ports, and 12-V/24-V automotive power systems.

For engineers reviewing the TPS54561QDPRTQ1 datasheet, TPS54561QDPRTQ1 pinout, TPS54561QDPRTQ1 application, or TPS54561QDPRTQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to 125°C ambient), adjustable 100-kHz to 2.5-MHz switching frequency via RT/CLK, integrated BOOT recharge FET for low-dropout operation, and open-drain PWRGD monitoring of ±7% output voltage deviation.

Technical Context

The TPS54561QDPRTQ1 implements constant-frequency peak-current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier (350-µS transconductance) drives the PWM comparator through the COMP pin, while cycle-by-cycle current limiting and frequency foldback protect during overload.

It supports dual operating modes on the RT/CLK pin: resistor-programmed frequency (100 kHz–2.5 MHz) or external clock synchronization (160 kHz–2.3 MHz) with PLL lock-in time under 78 µs. The integrated BOOT recharge FET enables >99% duty cycle operation, allowing output voltages approaching the minimum input supply.

Key Specifications

Pinout & Package

TPS54561QDPRTQ1 is housed in a thermally enhanced 10-pin WSON package (4.0 mm × 4.0 mm) with exposed thermal pad electrically connected to GND. The package supports high-power density layouts and requires PCB copper area under the thermal pad for junction-to-board thermal resistance of 12.3°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with LM5164QPWPRQ1, TPS54561QDPRTQ1 delivers 5× more output current and adds Eco-mode for superior light-load efficiency; compared with TPS54560QDGQRQ1, it provides 1.4× higher current capacity while retaining identical footprint and feature set-enabling scalable design reuse.

Availability

TPS54561QDPRTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, USB charging infrastructure, and 12-V/24-V vehicle power systems requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for TPS54561QDPRTQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management ICs for automotive, industrial, and communications markets.

The TPS54561-Q1 product line delivers high-voltage, high-current synchronous buck converters engineered for automotive safety-critical power rails, featuring AEC-Q100 qualification, robust transient immunity, and integrated diagnostics.

FAQ

What is the maximum input voltage the TPS54561QDPRTQ1 can withstand during load dump events?

The TPS54561QDPRTQ1 survives load dump pulses up to 65 V per ISO 7637-2, with absolute maximum input rating of 65 V on the VDD pin. This makes it suitable for 12-V and 24-V automotive systems without external overvoltage clamping in most cases. The device's internal protection circuitry remains functional during these transients, and the TPS54561QDPRTQ1 continues regulation once the pulse subsides.

How does the Eco-mode™ operation improve efficiency at light loads in the TPS54561QDPRTQ1?

The TPS54561QDPRTQ1 enters Eco-mode™ when output current drops below the pulse-skipping threshold-typically ~25 mA with standard inductors-by clamping the COMP pin at 600 mV and halting switching. This reduces gate-drive and switching losses, enabling 152-µA quiescent current and >85% efficiency at 10-mA load. The TPS54561QDPRTQ1 resumes normal PWM only when output droop demands recovery, ensuring clean regulation without audible noise.

Can the TPS54561QDPRTQ1 synchronize to an external clock, and what are the timing requirements?

Yes, the TPS54561QDPRTQ1 synchronizes to an external clock applied to the RT/CLK pin when pulled above 1.55 V, disabling the internal oscillator. It accepts clock frequencies from 160 kHz to 2.3 MHz, with minimum pulse width of 15 ns. PLL lock-in time is 78 µs at 500 kHz. The TPS54561QDPRTQ1 maintains synchronization even during Eco-mode, ensuring deterministic timing for noise-sensitive systems like ADAS sensors.

What is the purpose of the SS/TR pin on the TPS54561QDPRTQ1, and how is it used for power sequencing?

The SS/TR pin on the TPS54561QDPRTQ1 controls soft-start ramp time via an external capacitor and enables tracking/sequencing by accepting an external voltage reference. For sequencing, connect a resistor divider from a master rail to GND, feeding the SS/TR pin; the TPS54561QDPRTQ1 output follows that voltage until regulation is reached. This ensures controlled power-up order between multiple rails, preventing latch-up or inrush conflicts in complex automotive ECUs.

Does the TPS54561QDPRTQ1 require an external bootstrap diode, and how is the BOOT capacitor sized?

No, the TPS54561QDPRTQ1 integrates a BOOT recharge FET, eliminating the need for an external bootstrap diode. A 0.1-µF X7R/X5R ceramic capacitor rated ≥10 V is recommended between BOOT and SW pins. This value ensures sufficient charge storage for gate drive across temperature and line/load conditions. The TPS54561QDPRTQ1's internal recharge circuit maintains BOOT-SW voltage above 1.8 V, enabling reliable high-duty-cycle operation down to <100-mV dropout.